15" rMBP (Late 2013) - flickering gray color

I've just recently started to notice this problem with my screen where any gray-like color will flicker. It's not a constant problem and I haven't been able to figure out what causes it to happen. I also haven't been able to find anyone posting about a similar problem online. So I was curious if anyone had ever heard of this problem and is there was any remedy to it?

I've tried taking a video of it - but the flicker isn't prominent enough for my camera to pick it up unfortunately.

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